Angle-measuring caliper



Filed Dec. 22, 1941 \Nm MN Patented Sept. 7, 1943 "iANGLE-MEASURINGCAMPER I Maga. Arnetrpruana, oreal y I vApplication December 2 2, 194'1;Serial No. 423,943

sciai'ms (cia3-98)" I f i, t

This invention relatesgenerally to measuring devicesand particularly tovan anglefmeasuring caliper. i A q f The main object of this' inventionisL to construct a caliper wherehyethe'relative angularit'y andV spacebetween the adjacent sides of two objects 4may be quickly and accuratelydetermined and transferred.

The second object is to reduce the amount of time required for lling inspaces between adjacent, faces of machine parts and supports which maybe rough or inaccurately finished.

The third object is to construct a device of the class described inwhich not only the angularity of the space is determined, but the extentor length of the measurement is also determined in order that a properchock may be prepared as a ller for the space.

The fourth object is to construct a device of the class described inwhich the utmost precision may be obtained in determining the spacingand angularity of two faces and in which extreme precision in themanufacture of the parts of the device is not essential.

These and other objects are accomplished in the manner set forth `in thefollowing specification as illustrated in the accompanying drawing, inwhich:

Fig. 1 is a side elevation of the device showing same in use.

Fig. 2 is a plan of Fig. 1.

Fig. 3 is a side elevation of the device showing same in a collapsedform. v

Fig. 4 is a fragmentary section taken along the lines 4-4 in Fig. 1.

Fig. 5 is a section taken along the line 5--5 in Fig. 1.

Fig. 6 is a section taken along Fig. 1.

Fig. 'l is a section taken along the line l-'I of Fig. 1.

Similar numbers refer to similar parts throughout the several views.

Referring in detail to the drawing, there is shown apair of elongatedarms I and II bethe une t-c in tween whose ends I2 and I3 are mountedthe toggle links I4 and I5. The links I4 and I5 are attached to the endsI2 and I3 by means of the pivot screws I3, and to each other by means ofthe screws I1.

The screws I and Il are each provided with a tubular nut I8. Attached tothe screws I'I between the links I4 and I5 are the spring fasteninglinks I3 between which is disposed the tension spring 20, the purpose ofwhich is to'act on the toggle links I4 and I5 to urge the inem` bers I0and II apart so theywill beinfull conv tact with the faces 2IV and22,the relative spacing and angularity of which it is sought tvodetermine.

The arm Il `is providedwithv an'elongated slot 23 -through whichextendsthescrew 24 which also passes through the extension'25 formed'onone ofthe links l5. The slot 23 is inclined somewhat with relation tothe face 26' of the end I3.

` Attached to the arm vIll by means of a screw'2l is a slotted arm 28whose slot 29 also receives the screw 24.

A clamping washer 35 is placed against the slotted arm 28 and is held bymeans of the knurled clamping nut 3I on the screw 24. It can be seen bythis construction that the nui; 3l can clamp the members 28, and II inrigid relationship, and aside from the clearance around the parts I5,I'IA and 21, x relationship between the members I0 and I I.

VTo prevent any error arising from the clearance between these partswhich is necessary to operation, or which may occur in manufacture, orwhich may develop in use, I have provided the slotted locking arm 32which is attached to the arm It, by means of the screw 33 and which isprovided with a slot 34 through which extends the screw 35 which alsopasses through the end of the member II.

A washer 35 is placed on the screw 35 against the arm 32, and a knurlednut 31 on the screw 35 makes it possible to x the ends 38 of the membersI Il and II with relation to each other.

It will be noted that the link I4--A has formed thereon an extension 39which engages the stop 4l) which is -in turn secured by the rivets 4I tothe adjacent link I4. The purpose of the arm y 39 is to limit themovement of the toggle links I4 and I5 and hold same in a collapsibleposition.

Itis also desirable to provide calibrations 42 along the ends I2 and I3in order to indicate the length of the taper or space being measured.

The operation of the device is as follows:

When desiring to ll the relative space between two surfaces 2I and 22,the operator merely inserts the device in collapsed form as shown inFig. 3 and permits the members Ill and II to operate under the action ofthe spring 20, at the same time moving it into position longitudinallyas far as desired. The knurled nuts 3l and 3l are then tightened and thedevice withdrawn after noting the readings at the edges 43 whichindicate the length of the measurement from the ends 44. E

appended claims.

I claim:

1. A device of the class describedconsist'ing of t' a pair of elongatedarms having two setsof opiposed toggle joints disposed between one pairofl arm ends and spaced adjustable braces disposed between the oppositepair of arm ends, and spring. means between said arms apart.k Y l l j 2.YIn afdevice-of `the class described, :the combination-,of a pair Iofelongatedqarms; onei-offsaid arms having. al slotv vformed thereintoward tone end thereof, the opposite ends of saidarms-constitutingw-ork enga-ging members,l a I'pair or ppposed togglejoints; between said arms including springs forurgingsame toward astraight line toggle joints for urging'sai'd" izo position, the jointsin said toggles being midway between said arms, one link of said toggleextending beyond its intermediate joint to the slot ln the opposite arm,a slotted brace link having a clamping bolt extending through the slotin said brace link, through the extension on said toggle.y

and through the slot on said arrn, one end of saidv brace link beinghinged to the unslotted arm, saidv slotted arm together with theextended toggle link and a portion of the .unslotted arm constituting. arigid' triangular frame',"and' a second slotted brace link disposedacross the ends of said armremote from their work engaging ends, and

a clamping bolt passing through the slot in said I 'lvsecondlinklintoone of said arms While the op- `posite endof saidsecond link is hingedto the 'remainingarm bination of a pair o f elongated arms, opposed'toggle joints between said arms near one end thereof cha racterizedY by having a= limit stopv on one of said-joints, aspringforjurgingsaid'v-toggie jointsl together in a manner to movesaidarms apart, and spaced clampsv betweenfsaidwanns adaptedAtoreleasablyf holdsai darmsin\ affixed

